You know when one part of a song buries itself deep within your brain, endlessly looping the same two lines over and over again, and you just can’t get enough of it? Mother Mother’ll do that to you. On their newest release, O My Heart, the Vancouver five unleash such a beast in the form of “Hayloft.” It’s rockin’, all kinds of rollin’, and endlessly addictive. Don’t say I didn’t warn you.